The situation that it will feel the lightest is Q. Option B
The Archimedes principle makes a stone in water to feel lighter
since of the buoyant force pressing against it, the stone feels lighter in the water since the effective gravitational force dragging it down is lessened. The weight of the water that the stone moves is equivalent to the apparent weight reduction in water.
Because buoyant force opposes gravity, an object seems lighter in fluids than it does in air, which explains why objects tend to float in them. An object will float if the buoyant force is greater than its weight; if not, it will sink.